This FIT file is corrupted. I'm getting a 1.5km activity while it should be around 7.5km.
I tried using https://www.fitfiletools.com/ which helped in the past but doesn't seem to help for this specific file.
I have also tried to use Fit File Repair Tool, but I was trying the demo version and half of the values are set to random values because of the demo version. I was able to retreive about 3.5km of the activity, but not the last half. If someone with the full version could help, it would be really appreciated so I can then upload it to garmin connect. I'll definitely consider buying the full version if someone is able to repair the file with it.